title: Preparation of titanium-grafted magnetic mesoporous silica for the enrichment of endogenous serum phosphopeptides.
abstract: As one of the most important post-translational modifications, reversible phosphorylation of protein plays crucial roles in a large number of biological processes. Moreover, endogenous phosphopeptides are also associated with certain human diseases. An efficient enrichment and separation method is the premise for successful identification and quantification of phosphopeptides. In this work, titanium grafted magnetic mesoporous silica (Fe3O4@Ti-mSiO2) was developed and applied for the enrichment of endogenous phosphopeptides. Fe3O4@Ti-mSiO2 particles were prepared by grafting titanocene dichloride on the inner walls of magnetic mesoporous silica and then being calcined to remove cyclopentadienyl ligand. The physicochemical properties of the prepared materials were characterized by energy dispersive X-ray spectroscopy (EDX), nitrogen adsorption-desorption analysis, X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and vibrating sample magnetometer (VSM). For selective enrichment of phosphopeptides, the prepared Fe3O4@Ti-mSiO2 particles were applied for tryptic digests of β-casein, mixtures of β-casein and bovine serum albumin (BSA), and low-fat milk. Finally, Fe3O4@Ti-mSiO2 was successfully applied for the enrichment of endogenous phosphopeptides from human serum.
authors.affiliation: Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Department of Chemistry, Wuhan University, Wuhan 430072, China.
authors.forename: Xiao-Shui
authors.initials: XS
authors.lastname: Li
authors.forename: Ya-Ni
authors.initials: YN
authors.lastname: Pan
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhao
authors.forename: Bi-Feng
authors.initials: BF
authors.lastname: Yuan
authors.forename: Lin
authors.initials: L
authors.lastname: Guo
authors.forename: Yu-Qi
authors.initials: YQ
authors.lastname: Feng
mesh_terms: D000327:Adsorption; D002846:Chromatography, Affinity / Q000295:instrumentation / Q000379:methods*; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006801:Humans; D010748:Phosphopeptides / Q000097:blood* / Q000737:chemistry / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D014025:Titanium / Q000737:chemistry*
chemical_list: D010748:Phosphopeptides; D012822:Silicon Dioxide; D014025:Titanium; D052203:Ferrosoferric Oxide
keywords: Endogenous phosphopeptides; Human serum; Metal oxide affinity chromatography; Titanium-grafted magnetic mesoporous silica